“Why is my bridge hurting?”

If there were no pre existing concerns over the anchor (abutment) teeth holding the bridge then it could well be An adjustment of the bite is required- either way a quick follow up with your Dr. is a good idea

The bridge could be hurting because your bite is off. You were missing a tooth the area and the bridge connects at least 3 or more teeth together. The bridge is fabricated based on the bite impression however your bite may be a little different than the impression showed the best thing is to go back for a bite adjustment if it is the bite your teeth should start to feel better but go back sooner than later because if you leave something high over a long time that could potentially cause irreversible damage to your teeth. If the tooth continues to hurt after a few weeks after the adjustment you could be experiencing irreversible pulpits which is when you work on a tooth with an unhealthy nerve and unfortunately dentists cannot see that so once the treatment is done the tooth is not healing as it should and that is when other treatment like a
root canal would be needed. But the bite adjustment may be all you need.

You can follow up with your dentist. There are a few reasons it could be hurting. They can figure it out.

Just like a new pair of shoes, a new dental device takes time for the body to get used to it. If it was placed with the teeth adjacent holding it, they are taking a force that will eventually go away.

Definitely call a dentist.

A fixed bridge generally does not cause discomfort.  You should definitely return it to the dentist who placed it because many things could be going on and may not resolve on their own.

Yes. Call the dentist who inserted the bridge.